import { Enumerable } from '../../dist/index.esm.min.js'

export const createIterator = (arr = []) => {
  let index = 0
  return {
    next() {
      return index < arr.length ? {
        value: arr[index++],
        done: false
      } : { done: true }
    }
  }
}

export const createIterable = arr => ({
  [Symbol.iterator]() {
    return createIterator(arr)
  }
})

export const createEnumerator = (arr = []) => {
  let index = -1
  return {
    get current() { return arr[index] },
    moveNext() {
      index += 1
      return index < arr.length
    },
    reset() {
      index = -1
    }
  }
}

export const createEnumerable = arr => new Enumerable(createEnumerator(arr))